The solution presented herein introduces variable repetition levels for control and data transmissions via a physical downlink control channel for machine-type communications, e.g., the M-PDDCH. When a wireless terminal detects and correctly decodes a message carried by physical downlink control channel for machine-type communications that requests retransmissions, the wireless terminal performs adaptive uplink retransmissions according to a retransmission format defined by the message. The retransmission format defines at least one of a modulation and coding rate for the retransmissions, a frequency resource for the retransmissions, and a number of repetitions.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method performed by a wireless terminal in communication with a wireless network node, the method comprising: receiving a grant for uplink transmission from the network node, wherein the received grant indicates a first number of repetitions; transmitting on an uplink shared channel according to the first number of repetitions; monitoring a first channel for a message a first number of subframes after the wireless terminal transmits on the uplink shared channel according to the first number of repetitions, wherein the first channel comprises a physical downlink control channel for machine-type communications; and if the message is detected and correctly decoded, and if the decoded message requests retransmission, performing adaptive uplink retransmission according to a first retransmission format indicated by the decoded message.
This invention relates to wireless communication systems, specifically methods for adaptive retransmission in machine-type communications (MTC). The problem addressed is improving reliability and efficiency in uplink transmissions for MTC devices, which often operate in challenging radio conditions and require robust retransmission mechanisms. The method involves a wireless terminal communicating with a network node. The terminal receives a grant for uplink transmission, specifying a first number of repetitions. The terminal then transmits data on an uplink shared channel using the granted number of repetitions. After transmission, the terminal monitors a physical downlink control channel (PDCCH) for MTC for a message, starting a first number of subframes after the last transmission. If the terminal detects and correctly decodes the message, and the message requests retransmission, the terminal performs adaptive retransmission. The retransmission follows a first retransmission format indicated in the decoded message, allowing dynamic adjustment based on current channel conditions. This approach enhances reliability by ensuring retransmissions are tailored to the terminal's needs, reducing unnecessary transmissions and improving spectral efficiency. The method is particularly useful for MTC devices, which often require low-power, high-reliability communication.
2. The method of claim 1 further comprising performing non-adaptive retransmission according to a second retransmission format if at least one of the message is not detected, the message is not correctly decoded, and the decoded message does not request retransmission, wherein the second retransmission format comprises a currently controlling retransmission format received from the network node before detection of the message.
This invention relates to wireless communication systems, specifically methods for retransmitting messages in scenarios where initial transmission attempts fail. The problem addressed is ensuring reliable message delivery in wireless networks where messages may be lost, corrupted, or not properly acknowledged, leading to communication failures. The method involves a retransmission process that adapts based on feedback from a network node. If a message is not detected, not correctly decoded, or the decoded message does not explicitly request retransmission, the system performs a non-adaptive retransmission. This retransmission uses a predefined retransmission format, specifically the most recent retransmission format received from the network node before the message was detected. This ensures consistency in retransmission parameters, reducing the risk of further transmission errors due to mismatched formats. The approach improves reliability by avoiding unnecessary retransmission requests while maintaining compatibility with the network's current transmission standards. It is particularly useful in dynamic wireless environments where transmission conditions may vary, ensuring that retransmissions align with the latest network configurations. The method enhances communication efficiency by minimizing redundant retransmissions and optimizing resource usage.
3. The method of claim 1 wherein the adaptive uplink retransmission comprises asynchronous uplink retransmission, and wherein the message includes downlink control information indicating a process number for the adaptive uplink retransmission.
This invention relates to wireless communication systems, specifically improving uplink retransmission efficiency. The problem addressed is the inefficiency in traditional synchronous uplink retransmission schemes, which require strict timing alignment and may lead to unnecessary delays or resource waste. The solution involves an adaptive uplink retransmission mechanism that supports asynchronous retransmissions, allowing greater flexibility in scheduling and resource allocation. The method includes transmitting a message from a base station to a user device, where the message contains downlink control information (DCI) that specifies a process number for the adaptive uplink retransmission. This process number identifies the specific retransmission instance, enabling the user device to manage multiple retransmission processes independently. The asynchronous nature of the retransmission allows the base station to dynamically adjust retransmission timing based on network conditions, reducing latency and improving spectral efficiency. The adaptive uplink retransmission mechanism may also involve hybrid automatic repeat request (HARQ) processes, where the process number in the DCI helps the user device correlate the retransmission with the correct HARQ buffer entry. This ensures proper data integrity and reduces the risk of misalignment between the base station and the user device. The solution enhances overall system performance by optimizing retransmission scheduling and resource utilization in wireless communication networks.
4. The method of claim 3 wherein the process number comprises a hybrid automatic repeat request (HARQ) process number.
The invention relates to wireless communication systems, specifically improving error handling in data transmission. The problem addressed is the need for efficient and reliable data recovery in scenarios where transmission errors occur, particularly in systems using hybrid automatic repeat request (HARQ) protocols. HARQ is a technique that combines forward error correction and retransmission to enhance data integrity, but managing HARQ processes can be complex, especially when multiple transmissions are involved. The invention describes a method for assigning and tracking HARQ process numbers to manage retransmissions in a communication system. A HARQ process number is a unique identifier used to track individual data transmissions and their associated retransmissions. By incorporating the HARQ process number, the system can distinguish between different data transmissions, ensuring that retransmissions are correctly aligned with their original transmissions. This helps prevent errors where retransmitted data is misaligned or lost, improving overall transmission reliability. The method involves generating or receiving a HARQ process number for a data transmission and using it to coordinate retransmissions. The process number may be derived from a sequence number, a counter, or another identifier that ensures uniqueness within a given transmission window. The system then uses this number to manage retransmission attempts, ensuring that each retransmission is correctly associated with its original transmission. This approach enhances data recovery efficiency and reduces the likelihood of errors in retransmission handling. The invention is particularly useful in wireless communication systems where signal interference and errors are common, such as in cellular networks
5. The method of claim 1 wherein the first retransmission format defines at least one of a modulation and coding rate for the adaptive uplink retransmission, a frequency resource for the adaptive uplink retransmission, and a second number of repetitions for the adaptive uplink retransmission.
This invention relates to wireless communication systems, specifically adaptive uplink retransmission techniques for improving reliability in data transmission. The problem addressed is the need for efficient and flexible retransmission mechanisms to handle varying channel conditions and interference in wireless networks. The invention describes a method for adaptive uplink retransmission where a first retransmission format is defined to include at least one of the following parameters: a modulation and coding rate, a frequency resource, or a second number of repetitions. These parameters are dynamically adjusted based on channel conditions to optimize retransmission performance. The modulation and coding rate determines the balance between data throughput and reliability, while the frequency resource specifies the allocated bandwidth for retransmission. The second number of repetitions refers to the number of times the same data is transmitted to enhance reliability in poor channel conditions. Additionally, the method may involve determining a first retransmission format for an initial adaptive uplink retransmission and a second retransmission format for a subsequent adaptive uplink retransmission. The retransmission formats are selected based on feedback from the receiver, such as acknowledgment (ACK) or negative acknowledgment (NACK) signals, to adapt to changing channel conditions. This adaptive approach ensures that retransmissions are tailored to the current network environment, improving overall communication efficiency and reliability. The invention is particularly useful in scenarios where channel conditions fluctuate, such as in mobile wireless networks.
6. The method of claim 1 wherein receiving the grant for uplink transmission comprises receiving a downlink control information (DCI) indicating a grant for random access channel (RACH) Msg3 transmission.
This invention relates to wireless communication systems, specifically improving the efficiency of uplink transmission in scenarios involving random access procedures. The problem addressed is the need for a user equipment (UE) to efficiently receive and utilize uplink transmission grants, particularly during random access channel (RACH) procedures, to minimize latency and resource wastage. The method involves a user equipment (UE) receiving a downlink control information (DCI) message that includes a grant for uplink transmission. This grant specifically authorizes the UE to transmit a RACH Msg3 message, which is part of the random access procedure used to establish or resume a connection with a base station. The DCI may include scheduling information, such as time and frequency resources, modulation and coding scheme (MCS), and power control parameters, to ensure proper transmission of the Msg3 message. The UE then transmits the Msg3 message in accordance with the received grant, allowing the base station to allocate resources dynamically and efficiently. This approach optimizes uplink transmission by reducing signaling overhead and improving synchronization between the UE and the base station during the random access process. The method is particularly useful in scenarios where low-latency communication is critical, such as in 5G and beyond networks.
7. A wireless terminal in communication with a wireless network node, the wireless terminal comprising: a receiver configured to receive a grant for uplink transmission from the network node, wherein the received grant indicates a first number of repetitions; a transmitter configured to transmit on an uplink shared channel according to the first number of repetitions; and a processing circuit configured to monitor a first channel for a message a first number of subframes after the transmitter transmits on the uplink shared channel according to the first number of repetitions, wherein the first channel comprises a physical downlink control channel for machine-type communications (MTC); if the processing circuit detects and correctly decodes the message, and if the decoded message requests retransmission, the processing circuit is further configured to perform adaptive uplink retransmission, via the transmitter, according to a first retransmission format indicated by the decoded message.
This invention relates to wireless communication systems, specifically improving reliability and efficiency in machine-type communications (MTC) by optimizing uplink retransmission procedures. The problem addressed is the need for robust and adaptive retransmission mechanisms in scenarios where initial transmissions may fail due to channel conditions or interference, particularly in MTC devices operating in challenging environments. The wireless terminal communicates with a network node and includes a receiver to obtain a grant for uplink transmission, specifying a first number of repetitions. The terminal transmits on an uplink shared channel using this repetition count. After transmission, the terminal monitors a physical downlink control channel (PDCCH) for MTC for a message during a first number of subframes. If the message is detected and correctly decoded, and if it requests retransmission, the terminal performs adaptive retransmission according to a first retransmission format indicated in the message. This adaptive approach allows the network to dynamically adjust retransmission parameters based on current channel conditions, improving reliability without excessive signaling overhead. The solution enhances MTC performance by balancing retransmission efficiency and resource utilization.
8. The wireless terminal of claim 7 wherein the processing circuit is further configured to perform non-adaptive retransmission, via the transmitter, according to a second retransmission format if at least one of the message is not detected, the message is not correctly decoded, and the message does not request retransmission, wherein the second retransmission format comprises a currently controlling retransmission format previously received from the network node.
This invention relates to wireless communication systems, specifically improving message retransmission reliability in wireless terminals. The problem addressed is ensuring successful message delivery when initial transmissions fail due to detection errors, decoding failures, or lack of explicit retransmission requests. The solution involves a wireless terminal that performs non-adaptive retransmission using a previously received retransmission format from a network node when certain failure conditions occur. The wireless terminal includes a processing circuit and a transmitter. The processing circuit detects transmission failures by determining whether a message was not detected, not correctly decoded, or did not request retransmission. In response to these conditions, the processing circuit initiates non-adaptive retransmission via the transmitter. The retransmission uses a second retransmission format, which is the currently controlling retransmission format previously received from the network node. This approach avoids the need for adaptive adjustments, simplifying the retransmission process while maintaining reliability. The system ensures that even when explicit retransmission requests are absent, the terminal can still recover lost or corrupted messages by relying on the most recent valid retransmission format from the network. This method improves communication robustness in scenarios with unreliable initial transmissions.
9. The wireless terminal of claim 7 wherein the adaptive uplink retransmission comprises asynchronous uplink retransmission, and wherein the message includes downlink control information indicating a process number for the adaptive uplink retransmission.
This invention relates to wireless communication systems, specifically improving uplink retransmission mechanisms in wireless terminals. The problem addressed is inefficient or unreliable data retransmission in wireless networks, particularly when dealing with varying channel conditions or asynchronous communication requirements. The wireless terminal includes a receiver configured to receive a message from a base station, where the message includes downlink control information (DCI) that specifies a process number for an adaptive uplink retransmission. The terminal also includes a transmitter configured to perform asynchronous uplink retransmission based on the received DCI. Asynchronous retransmission allows the terminal to retransmit data at flexible timing, improving efficiency and reliability compared to synchronous retransmission, which requires fixed timing intervals. The process number in the DCI helps the terminal identify and manage the specific retransmission process, ensuring proper handling of multiple retransmissions. The terminal may also include a processor to determine whether to perform the retransmission based on the received DCI and the process number. This adaptive approach allows the terminal to dynamically adjust retransmission behavior, optimizing performance under different network conditions. The invention enhances data transmission reliability and efficiency in wireless networks by enabling flexible, process-specific retransmission control.
10. The wireless terminal of claim 9 wherein the process number comprises a hybrid automatic repeat request (HARQ) process number.
A wireless terminal is disclosed for managing communication in a wireless network, particularly addressing the challenge of efficiently handling data retransmissions in high-latency or unreliable communication environments. The terminal includes a processor configured to assign a process number to a data transmission, where the process number is specifically a hybrid automatic repeat request (HARQ) process number. HARQ is a protocol used to improve reliability by combining forward error correction with retransmission of erroneous data packets. The terminal further includes a memory storing instructions that, when executed by the processor, cause the terminal to transmit the data and monitor for acknowledgment signals from a receiving device. If no acknowledgment is received, the terminal retransmits the data using the same HARQ process number, allowing the receiver to combine the original and retransmitted data to improve decoding accuracy. The terminal may also adjust the HARQ process number based on network conditions, such as latency or interference, to optimize retransmission efficiency. This approach reduces unnecessary retransmissions and improves overall communication reliability in dynamic wireless environments.
11. The wireless terminal of claim 7 wherein the first retransmission format defines at least one of a modulation and coding rate for the adaptive uplink retransmission, a frequency resource for the adaptive uplink retransmission, and a second number of repetitions for the adaptive uplink retransmission.
A wireless terminal is configured to adaptively retransmit uplink data based on feedback from a network node. The terminal receives an initial transmission of uplink data and, upon detecting a need for retransmission, selects a retransmission format from a set of predefined formats. The retransmission format specifies parameters such as modulation and coding rate, frequency resource allocation, and the number of repetitions for the retransmission. The terminal then retransmits the data using the selected format. The network node evaluates the retransmission and may provide feedback to further adjust the retransmission parameters. This adaptive approach improves reliability and efficiency in wireless communications by dynamically optimizing retransmission settings based on channel conditions and network feedback. The system is particularly useful in scenarios where static retransmission configurations may be suboptimal, such as in environments with varying interference or signal quality. The terminal may also support multiple retransmission formats, allowing for flexible adaptation to different network conditions. The retransmission process may involve multiple rounds of feedback and adjustment to refine the transmission parameters until successful delivery is achieved. This method enhances data throughput and reduces latency in wireless networks by minimizing unnecessary retransmissions and optimizing resource usage.
12. The wireless terminal of claim 7 wherein the grant for uplink transmission comprises a downlink control information (DCI) indicating a grant for random access channel (RACH) Msg3 transmission.
This invention relates to wireless communication systems, specifically improving the efficiency of uplink transmissions in scenarios involving random access procedures. The problem addressed is the need for a wireless terminal to efficiently obtain uplink transmission resources, particularly for transmitting RACH Msg3 messages, which are part of the random access process in cellular networks. Traditional methods often require additional signaling or delays, leading to inefficiencies. The invention describes a wireless terminal configured to receive a grant for uplink transmission, where the grant is embedded within downlink control information (DCI). This DCI specifically indicates a grant for transmitting RACH Msg3, which is the third message in the random access procedure. The terminal processes this DCI to determine the allocated uplink resources for Msg3 transmission, allowing for faster and more efficient resource allocation without requiring additional signaling steps. The terminal may also include a receiver to obtain the DCI and a transmitter to send the Msg3 message using the granted resources. This approach reduces latency and signaling overhead in the random access process, improving overall system performance. The invention is particularly useful in scenarios where quick and reliable uplink transmission is critical, such as in high-traffic or low-latency applications.
13. The wireless terminal of claim 7 wherein the wireless terminal comprises a low complexity wireless terminal.
A wireless terminal is designed to operate in a wireless communication system, particularly for low-complexity devices that require efficient power and processing resource management. The terminal includes a receiver configured to receive a downlink signal from a base station, where the downlink signal contains control information for scheduling uplink transmissions. The terminal also includes a transmitter configured to send an uplink signal to the base station, where the uplink signal includes data or control information. The terminal further includes a processor that processes the received downlink signal to extract scheduling information and determines the timing and resources for the uplink transmission. The terminal is optimized for low complexity, meaning it has limited processing power and memory compared to standard wireless terminals, making it suitable for devices with constrained resources, such as IoT sensors or low-power communication devices. The terminal may also include a power management module to minimize energy consumption during communication, ensuring long battery life. The design ensures reliable communication while maintaining low operational overhead, addressing the need for efficient wireless communication in resource-constrained environments.
14. The wireless terminal of claim 13 wherein the low complexity wireless terminal comprises an MTC wireless terminal.
This invention relates to wireless communication systems, specifically addressing the need for low-complexity wireless terminals to efficiently manage communication with a network. The problem being solved is the high power consumption and processing overhead in low-complexity devices, such as Machine-Type Communication (MTC) terminals, when handling network signaling and data transmission. The invention describes a wireless terminal designed to reduce complexity and power consumption by optimizing its interaction with the network. The terminal includes a receiver configured to monitor a control channel for downlink control information, which may include scheduling assignments or other network commands. The terminal also includes a transmitter for sending uplink control information, such as acknowledgments or channel state feedback, to the network. To minimize processing, the terminal may use simplified procedures for receiving and transmitting data, such as reduced bandwidth operations or discontinuous reception (DRX) modes. The terminal may further include a processor to handle the received control information and generate appropriate responses, ensuring efficient resource utilization. The design allows the terminal to operate with minimal hardware and processing capabilities while maintaining reliable communication with the network. This is particularly useful for MTC devices, which often have strict power and cost constraints. The invention ensures that such terminals can function effectively in modern wireless networks without excessive resource consumption.
15. A computer program product stored in a non-transitory computer readable medium for controlling a wireless terminal in communication with a wireless network node, the computer program product comprising software instructions that when run on the wireless terminal, causes the wireless terminal to: receive a grant for uplink transmission from the network node, wherein the received grant indicates a first number of repetitions; transmit on an uplink shared channel according to the first number of repetitions; monitor a first channel for a message a first number of subframes after the wireless terminal transmits on the uplink shared channel according to the first number of repetitions, wherein the first channel comprises a physical downlink control channel for machine-type communications; and if the message is detected and correctly decoded, and if the decoded message requests retransmission, perform adaptive uplink retransmission according to a first retransmission format indicated by the decoded message.
This invention relates to wireless communication systems, specifically methods for controlling uplink transmissions in machine-type communication (MTC) devices. The problem addressed is efficient and reliable uplink retransmission in scenarios where initial transmissions may fail due to channel conditions or interference. The solution involves a computer program stored on a non-transitory medium that executes on a wireless terminal to manage uplink transmissions and retransmissions in coordination with a network node. The program causes the wireless terminal to receive an uplink transmission grant from the network node, specifying a first number of transmission repetitions. The terminal then transmits data on an uplink shared channel using the granted number of repetitions. After transmission, the terminal monitors a physical downlink control channel (PDCCH) for MTC for a message within a first number of subframes. If the message is detected and correctly decoded, and if it requests retransmission, the terminal performs adaptive retransmission using a retransmission format indicated in the message. This adaptive approach allows the network to dynamically adjust retransmission parameters based on current channel conditions, improving reliability and efficiency in MTC communications. The system ensures proper synchronization between the terminal and network node for retransmission procedures.
16. A method performed by a wireless network node in communication with a wireless terminal, the method comprising: transmitting a grant for uplink transmission to the wireless terminal, wherein the transmitted grant indicates a first number of uplink repetitions; and transmitting a message to the wireless terminal via a first channel comprising a physical downlink control channel for machine-type communications to provide an adaptive retransmission format to the wireless terminal a first number of subframes after the wireless terminal transmits on an uplink shared channel according to the first number of uplink repetitions, the adaptive retransmission format being for a subsequent uplink retransmission from the wireless terminal.
This invention relates to wireless communication systems, specifically improving uplink transmission reliability for machine-type communications (MTC). The problem addressed is ensuring efficient and adaptive retransmission mechanisms in scenarios where initial uplink transmissions may fail due to channel conditions or interference. The solution involves a wireless network node dynamically adjusting retransmission formats based on feedback from the wireless terminal. The method begins with the network node transmitting a grant to a wireless terminal, specifying a first number of uplink repetitions for an initial transmission. The terminal then transmits data on an uplink shared channel using the granted repetitions. After this transmission, the network node sends a message via a physical downlink control channel (PDCCH) for MTC, providing an adaptive retransmission format to the terminal. This message is transmitted a predefined number of subframes after the initial uplink transmission. The adaptive retransmission format is used for subsequent retransmissions, allowing the system to optimize reliability and resource usage based on real-time conditions. The solution enhances MTC performance by dynamically adapting retransmission strategies without requiring preconfigured fixed formats.
17. The method of claim 16 wherein the adaptive retransmission format defines at least one of a modulation and coding rate for the adaptive uplink retransmission, a frequency resource for the adaptive uplink retransmission, and a second number of repetitions for the adaptive uplink retransmission.
This invention relates to wireless communication systems, specifically adaptive retransmission techniques for uplink transmissions. The problem addressed is improving reliability and efficiency in wireless networks by dynamically adjusting retransmission parameters based on channel conditions or other factors. The method involves adaptive retransmission of uplink data in a wireless communication system. When a retransmission is needed, the system determines an adaptive retransmission format that includes at least one of the following: a modulation and coding rate for the retransmission, a frequency resource allocation for the retransmission, or a second number of repetitions for the retransmission. The modulation and coding rate may be adjusted to balance reliability and throughput, while the frequency resource allocation can optimize spectrum usage. The second number of repetitions allows for flexible redundancy based on channel conditions. These parameters are selected to improve the likelihood of successful retransmission while minimizing resource usage. The method may also involve receiving feedback from a receiver to determine the optimal retransmission format. This adaptive approach enhances communication reliability in varying channel conditions, particularly in scenarios with high interference or mobility.
18. The method of claim 16 wherein transmitting the grant for uplink transmission comprises transmitting a downlink control information (DCI) indicating a grant for random access channel (RACH) Msg3 transmission.
This invention relates to wireless communication systems, specifically improving the efficiency of uplink transmission in scenarios involving random access procedures. The problem addressed is the need for a more streamlined and reliable mechanism for granting uplink transmission opportunities, particularly for messages like Msg3 in a random access channel (RACH) process. Traditional methods may suffer from delays or inefficiencies in allocating resources for such transmissions. The invention describes a method where a base station transmits a downlink control information (DCI) signal to a user device. This DCI signal includes a grant specifically for uplink transmission, allowing the user device to send a RACH Msg3 message. The DCI signal may include additional parameters such as resource allocation details, modulation and coding scheme (MCS) information, or timing advance adjustments to ensure proper synchronization. The method ensures that the user device can efficiently transmit the Msg3 message without unnecessary delays or resource conflicts, improving overall system performance and reducing latency in the random access procedure. The invention may also include mechanisms to handle retransmissions or adjustments based on feedback from the user device, further optimizing the uplink transmission process.
19. The method of claim 16 wherein the adaptive uplink retransmission comprises asynchronous uplink retransmission, and wherein the message includes downlink control information indicating a process number for the subsequent uplink retransmissions from the wireless terminal.
This invention relates to wireless communication systems, specifically improving uplink retransmission efficiency in scenarios where adaptive retransmission is required. The problem addressed is the inefficiency and potential delays in current uplink retransmission schemes, particularly when handling asynchronous retransmissions where timing and coordination between the wireless terminal and the base station are critical. The method involves an adaptive uplink retransmission mechanism that operates asynchronously, meaning the retransmission timing is not strictly synchronized with predefined slots or intervals. This flexibility allows for more efficient use of network resources and reduces latency. A key aspect is the inclusion of downlink control information (DCI) in a message sent from the base station to the wireless terminal. This DCI specifies a process number for subsequent uplink retransmissions, enabling the terminal to identify and manage multiple retransmission processes independently. The process number helps distinguish between different retransmission attempts, ensuring proper sequencing and reducing the risk of misalignment or conflicts. The method also includes a mechanism for the wireless terminal to determine whether to perform a retransmission based on the received DCI. This decision-making process may involve evaluating the process number, the current network conditions, or other factors to optimize retransmission timing and resource allocation. The overall approach enhances reliability and efficiency in wireless communication by dynamically adapting retransmission parameters while maintaining clear coordination between the terminal and the base station.
20. The method of claim 19 wherein the process number comprises a hybrid automatic repeat request (HARQ) process number.
A system and method for wireless communication involves managing data transmission processes in a network, particularly in scenarios where multiple data packets are transmitted and acknowledged. The invention addresses the challenge of efficiently tracking and recovering lost or corrupted data packets in wireless communication systems, such as those using hybrid automatic repeat request (HARQ) protocols. HARQ is a technique that combines forward error correction and retransmission to improve reliability. The method includes assigning a process number to each data transmission, where the process number uniquely identifies the transmission and its associated retransmission attempts. The process number is used to track the status of each transmission, including whether it has been successfully received or requires retransmission. In this specific aspect, the process number is a HARQ process number, which is used in HARQ protocols to manage retransmissions of data packets. The HARQ process number helps distinguish between different HARQ processes, allowing the system to handle multiple transmissions simultaneously without confusion. The method further involves storing the process number in a buffer or memory, where it is associated with the transmitted data. When a retransmission is needed, the system retrieves the process number to identify the correct data packet for retransmission. This ensures that only the necessary data is resent, improving efficiency and reducing unnecessary retransmissions. The system may also use the process number to synchronize acknowledgment signals between the transmitter and receiver, ensuring that both parties are aware of the transmission status. This approach enhances reliability and throughput in wireless communication networks.
21. A wireless network node in communication with a wireless terminal, the wireless network node comprising: a receiver; a transmitter configured to transmit a grant for uplink transmission to the wireless terminal, wherein the transmitted grant indicates a first number of repetitions; and a processing circuit configured to generate a message for a first channel comprising a physical downlink control channel for machine-type communications, wherein the message provides an adaptive retransmission format to the wireless terminal a first number of subframes after the wireless terminal transmits on an uplink shared channel according to the first number of repetitions, the adaptive retransmission format being for a subsequent uplink retransmission from the wireless terminal; wherein the transmitter is further configured to transmit the message via the first channel.
This invention relates to wireless communication systems, specifically for machine-type communications (MTC) where devices require reliable, low-latency retransmission mechanisms. The problem addressed is ensuring efficient and adaptive retransmission of uplink data from wireless terminals, particularly in scenarios where initial transmissions may fail due to interference or channel conditions. The wireless network node includes a receiver, a transmitter, and a processing circuit. The transmitter sends a grant to a wireless terminal, authorizing uplink transmission with a specified number of repetitions. After the terminal transmits on an uplink shared channel using the granted repetitions, the network node generates a message on a physical downlink control channel (PDCCH) for MTC. This message provides an adaptive retransmission format to the terminal, indicating how subsequent retransmissions should be structured. The adaptive format is sent a predefined number of subframes after the initial uplink transmission, allowing the terminal to adjust its retransmission strategy dynamically. The transmitter then sends this message to the terminal via the PDCCH. This approach improves reliability by dynamically adapting retransmission parameters based on real-time conditions, reducing unnecessary retransmissions and improving spectral efficiency in MTC scenarios.
22. The wireless network node of claim 21 wherein the adaptive retransmission format defines at least one of a modulation and coding rate for the adaptive uplink retransmission, a frequency resource for the adaptive uplink retransmission, and a second number of repetitions for the adaptive uplink retransmission.
In wireless communication systems, efficient retransmission mechanisms are critical for maintaining reliable data transmission, especially in challenging environments with interference or signal degradation. Existing retransmission schemes often use fixed parameters, which may not adapt to varying channel conditions, leading to inefficiencies in resource utilization and throughput. This invention addresses the need for an adaptive retransmission format in wireless network nodes to optimize uplink retransmissions based on real-time conditions. The invention involves a wireless network node configured to support adaptive uplink retransmissions. The node determines an adaptive retransmission format that dynamically adjusts key transmission parameters to improve reliability and efficiency. Specifically, the adaptive retransmission format may define one or more of the following: a modulation and coding rate tailored to current channel conditions, a frequency resource allocation to avoid interference, and a second number of repetitions for the retransmission to balance reliability and resource usage. By dynamically adjusting these parameters, the system can enhance data delivery success rates while minimizing unnecessary resource consumption. This approach is particularly useful in scenarios where channel conditions fluctuate, such as in mobile or high-interference environments. The adaptive retransmission format ensures that retransmissions are optimized for the specific conditions at the time of transmission, improving overall network performance.
23. The wireless network node of claim 21 wherein the grant for uplink transmission comprises a downlink control information (DCI) indicating a grant for random access channel (RACH) Msg3 transmission.
A wireless network node is configured to manage uplink transmissions in a wireless communication system, particularly for random access procedures. The node includes a processor and a transceiver. The processor is designed to generate a grant for uplink transmission, which is specifically a downlink control information (DCI) message. This DCI message includes a grant for transmitting a random access channel (RACH) Msg3 message. The transceiver is configured to send this DCI message to a user equipment (UE) device, enabling the UE to proceed with the RACH Msg3 transmission. The RACH Msg3 message is part of a four-step random access procedure, where the UE sends an initial preamble, receives a response, transmits Msg3 (containing user data or signaling), and awaits a final confirmation. The DCI grant ensures the UE has the necessary resources to transmit Msg3 without contention, improving efficiency and reducing delays in the random access process. This mechanism is particularly useful in scenarios where reliable and timely uplink transmissions are critical, such as in high-traffic or latency-sensitive networks. The node may also include additional features, such as scheduling multiple UEs or adjusting transmission parameters based on network conditions.
24. The wireless network node of claim 21 wherein the adaptive uplink retransmission comprises asynchronous uplink retransmission, and wherein the transmitted message includes downlink control information indicating a process number for the subsequent uplink retransmissions.
This invention relates to wireless network nodes configured to manage adaptive uplink retransmissions in a wireless communication system. The problem addressed is the need for efficient and flexible retransmission mechanisms to improve reliability and reduce latency in wireless communications, particularly in scenarios with varying channel conditions or interference. The wireless network node includes a processor and a memory storing instructions that, when executed, cause the node to perform adaptive uplink retransmission. Specifically, the node supports asynchronous uplink retransmission, where retransmissions are not strictly synchronized with predefined time slots. This allows for more dynamic scheduling and better resource utilization. The transmitted message from the node includes downlink control information (DCI) that specifies a process number for subsequent uplink retransmissions. This process number helps the receiving device identify and manage the retransmission process, ensuring proper synchronization and error recovery. The adaptive nature of the retransmission mechanism allows the system to adjust retransmission parameters based on real-time conditions, such as signal quality or network congestion, thereby optimizing performance. The solution enhances reliability and efficiency in wireless communication systems by providing a flexible and responsive retransmission framework.
25. The wireless network node of claim 24 wherein the process number comprises a hybrid automatic repeat request (HARQ) process number.
A wireless network node is configured to manage communication in a wireless network, particularly addressing challenges in efficient data transmission and retransmission. The node includes a processor and a memory storing instructions that, when executed, cause the processor to assign a process number to a data transmission. This process number is specifically a hybrid automatic repeat request (HARQ) process number, which is used to track and manage retransmissions of data packets in the network. HARQ is a protocol that combines forward error correction and retransmission to improve reliability and efficiency in wireless communications. By assigning a HARQ process number, the node can uniquely identify each transmission attempt, allowing the system to distinguish between initial transmissions and retransmissions. This helps in maintaining synchronization, reducing latency, and optimizing resource allocation in the network. The node may also include additional components, such as a transceiver for sending and receiving data, and a controller for managing the overall communication process. The use of HARQ process numbers ensures that data integrity is maintained, especially in environments with high interference or signal degradation, by enabling the system to request retransmissions only for corrupted or lost packets. This approach enhances the overall performance and reliability of wireless communication systems.
26. A computer program product stored in a non-transitory computer readable medium for controlling a wireless network node in communication with a wireless terminal, the computer program product comprising software instructions that when run on the wireless network node, causes the wireless network node to: transmit a grant for uplink transmission to the wireless terminal, wherein the transmitted grant indicates a first number of uplink repetitions; and transmit a message to the wireless terminal via a first channel comprising a physical downlink control channel for machine-type communications to provide an adaptive retransmission format to the wireless terminal a first number of subframes after the wireless terminal transmits on an uplink shared channel according to the first number of uplink repetitions, the adaptive retransmission format being for a subsequent uplink retransmission from the wireless terminal.
This invention relates to wireless communication systems, specifically improving uplink transmission reliability for machine-type communications (MTC). The problem addressed is ensuring efficient retransmission of uplink data in scenarios where initial transmissions may fail due to channel conditions or interference. The solution involves a wireless network node that transmits a grant to a wireless terminal, specifying a first number of uplink repetitions for initial transmission. After the terminal completes these repetitions, the network node sends an adaptive retransmission format via a physical downlink control channel (PDCCH) for MTC. This format is provided a first number of subframes after the terminal's initial transmission and is used for subsequent retransmissions, allowing dynamic adjustment of retransmission parameters based on real-time conditions. The system enhances reliability and efficiency in MTC by combining initial repetition with adaptive retransmission control, reducing the need for fixed retransmission schemes. The invention is particularly useful in IoT and low-power wide-area network (LPWAN) applications where devices operate under challenging radio conditions.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
August 5, 2016
March 29, 2022
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